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Class 4 (4th Engineer) MEKM 📅 Oct 2025

Exam Question

The maritime decarbonization is a priority and there are various ships that are operating on alternative fuels. Discuss few potential alternate fuels by comparing their properties and list the advantages & disadvantages of at least three alternative fuels. (16)

Reference Answer

### Introduction
In response to the International Maritime Organization's (IMO) stringent targets for decarbonization and the reduction of greenhouse gas (GHG) emissions, the maritime industry is actively exploring a range of alternative fuels. The transition from conventional heavy fuel oil (HFO) is critical to meet these goals. As noted in industry analysis, alternative fuels such as Liquefied Natural Gas (LNG), methanol, ammonia, and hydrogen are at the forefront of this transition, each presenting a unique combination of properties, benefits, and challenges regarding storage, handling, safety, and emissions profile. A successful transition requires a thorough understanding of these fuels to inform vessel design, operational procedures, and regulatory frameworks.
### Comparison of Potential Alternate Fuel Properties
A comparative analysis of key physical and chemical properties is essential for evaluating the feasibility of each alternative fuel for marine applications. The primary considerations are energy density, storage requirements, and safety parameters.

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